On Sun, Mar 10, 2002 at 04:25:54AM -0800, Brad Chapman wrote:
> Everyone,

Hello,

>       Does anyone have any information, code, or locations where I could
> get code for ICQ support in netfilter?

I started to hack together an ICQ (old protocol v.5) module for
netfilter but it was still-born due to insufficiencies with the
NAT/helper framework.

Specifically, (before newnat -- I have not looked at newnat yet, but
it supposedly solves the problems) only "single-shot" expectations
were available.  But even after I worked past that, with helpers that
reset the expectation (kinda like the way old signal handling worked
where one had to reset the signal in the handler), I found that a
helper could have only one expectation active at a time.  If a second
expectation was triggered, the first one was dropped.

Of course, a protocol such as ICQ's v.5 has multiple sub-channels
going at once, one for each "direct connection" in fact.  As such, it
needs to be able to handle multiple related rules.

But this was all for the v.5 protocol.  Most people are using v.7 (or
is it 8 already) now which is a completely different protocol (AOL
AIM).  I have no idea of it's workings and whether the same problems
exist with it or not.

b.

-- 
Brian J. Murrell

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